relax SVN archive

Removed all unused imports from the relax library package.

Added import exceptions for the lib.xml module in the find_unused_imports.py devel script.

These are needed because of eval() function calls on XML stored Python data structures.

Added import exceptions for the lib.compat module in the find_unused_imports.py devel script.

Removed all unused imports from the pipe_control package.

Removal of unused imports from the GUI test modules.

Added a workaround or hack for exceptions for circular imports in the find_unused_imports.py script.

This is currently for the test_suite.unit_tests._lib.test___init__ and
test_suite.unit_tests._lib._geometry.test___init__ modules.

Added another exception to the find_unused_imports.py devel script.

This is for the test_suite.unit_tests._lib._geometry.test_rotations module which programatically
obtains the imports using globals().

Removed unused imports from the unit tests.

Changed the import of pipe_control.state in the test_state unit test module.

Changed how the import of lib.regex in the Test_regex unit tests is used.

The module is no longer stored in the TestCase class namespace, but is rather called directly within
the unit test.